fix(sp21): drop dead code surfaced by code-quality review

- write.py: drop orphan run_reconcile() — no callers, and the
  pre-split store.py never had it. (The CycloneStore class already
  has _publish_events_sync + _sync_publish delegations; the spec's
  mention of _run_reconcile was a doc drift from the 2026-06-21
  plan, not a real requirement.)
- ui.py: drop duplicate _provider_orm_to_dict + _payer_orm_to_dict
  (canonical copies live in providers.py and are the only ones used;
  the ui.py copies were accidental duplicates from the split).
- orm_builders.py: drop orphan _cas_adjustment_row() — never called;
  _persist_835_remit() builds CAS rows inline.
- __init__.py: prune 30+ unused top-level imports and 9 unused
  re-exports. The facade only ever needs the type-hint-bearing
  BatchRecord family, the 4 read-path ORM-row serializers actually
  used inside the package, the 3 documented private helpers, and
  the 7 function-level re-exports the spec promises. Everything
  else was carryover from the original store.py header.

Tests at exact baseline: 1 failed, 1176 passed, 10 skipped
(the 1 failure is the pre-existing test_provider_detail isolation
flake documented in the spec).

backend/src/cyclone/store/__init__.py

@@ -38,30 +38,8 @@ Backward-compat shims for tests:
 
 from __future__ import annotations
 
-import json
 import threading
 from datetime import datetime, timezone
-from decimal import Decimal
-from typing import Any, Literal
-
-from pydantic import BaseModel, ConfigDict, model_validator
-
-from cyclone import db
-from cyclone.db import (
-    Ack,
-    ActivityEvent,
-    Batch,
-    CasAdjustment,
-    Claim,
-    ClaimState,
-    JSONText,
-    Match,
-    Remittance,
-)
-from cyclone.parsers.models import ClaimOutput, ParseResult
-from cyclone.parsers.models_835 import ClaimPayment, ParseResult835
-from cyclone.parsers.payer import PayerConfig835
-from cyclone.providers import Clearhouse, Payer, Provider  # SP9: ORM-row DTOs
 
 
 def utcnow() -> datetime:
@@ -112,8 +90,6 @@ from .orm_builders import (
     _remittance_835_row,
 )
 from .providers import (
-    _payer_orm_to_dict,
-    _provider_orm_to_dict,
     ensure_clearhouse_seeded,
     get_clearhouse,
     get_payer_config,
@@ -125,18 +101,9 @@ from .providers import (
 )
 from .records import BatchKind, BatchRecord, BatchRecord837, BatchRecord835
 from .ui import (
-    CLAIM_DETAIL_HISTORY_LIMIT,
-    _address_to_ui,
-    _date_in_bounds,
-    _iso_z,
-    _svc_to_wire_dict,
-    _validation_issues_to_ui,
-    to_activity_event,
-    to_ui_claim,
     to_ui_claim_detail,
     to_ui_claim_from_orm,
     to_ui_provider,
-    to_ui_remittance,
     to_ui_remittance_from_orm,
     to_ui_remittance_with_adjustments,
 )

backend/src/cyclone/store/orm_builders.py

@@ -96,27 +96,6 @@ def _remittance_835_row(cp: ClaimPayment, batch_id: str) -> Remittance:
     )
 
 
-def _cas_adjustment_row(adj, remittance_id: str) -> "db.CasAdjustment":
-    """Build a CasAdjustment ORM row from a ClaimAdjustment. NOT yet persisted.
-
-    One row per SVC-level CAS adjustment is persisted so the T10
-    reconcile aggregator can compute ``Remittance.adjustment_amount``
-    as ``SUM(CasAdjustment.amount) WHERE remittance_id = ...``.
-
-    ``quantity`` is optional in the X12 CAS spec; we coerce to Decimal
-    only when present to keep the column NULL for the common no-QTY case.
-    """
-    from cyclone.db import CasAdjustment
-    quantity = getattr(adj, "quantity", None)
-    return CasAdjustment(
-        remittance_id=remittance_id,
-        group_code=adj.group_code,
-        reason_code=adj.reason_code,
-        amount=Decimal(str(adj.amount)),
-        quantity=Decimal(str(quantity)) if quantity is not None else None,
-    )
-
-
 def _persist_835_remit(session, cp: "ClaimPayment", remittance_id: str) -> None:
     """SP7: persist ServiceLinePayment + CAS rows for one CLP composite.
 

backend/src/cyclone/store/ui.py

@@ -529,39 +529,4 @@ def _date_in_bounds(
         return False
     if date_to is not None and date_part > date_to:
         return False
-    return True
+    return True
-
-
-# ---------------------------------------------------------------------------
-# SP9: ORM-to-Pydantic conversion helpers
-# ---------------------------------------------------------------------------
-
-
-def _provider_orm_to_dict(row) -> dict:
-    return {
-        "npi": row.npi,
-        "label": row.label,
-        "legal_name": row.legal_name,
-        "tax_id": row.tax_id,
-        "taxonomy_code": row.taxonomy_code,
-        "address_line1": row.address_line1,
-        "address_line2": row.address_line2,
-        "city": row.city,
-        "state": row.state,
-        "zip": row.zip,
-        "is_active": bool(row.is_active),
-        "created_at": row.created_at,
-        "updated_at": row.updated_at,
-    }
-
-
-def _payer_orm_to_dict(row) -> dict:
-    return {
-        "payer_id": row.payer_id,
-        "name": row.name,
-        "receiver_name": row.receiver_name,
-        "receiver_id": row.receiver_id,
-        "is_active": bool(row.is_active),
-        "created_at": row.created_at,
-        "updated_at": row.updated_at,
-    }

backend/src/cyclone/store/write.py

@@ -238,13 +238,4 @@ def _sync_publish(event_bus, kind: str, payload: dict) -> None:
     """
     event = {**payload, "_kind": kind}
     for queue in list(event_bus._subscribers.get(kind, ())):
-        event_bus._enqueue_or_drop_oldest(queue, event)
+        event_bus._enqueue_or_drop_oldest(queue, event)
-
-
-def run_reconcile(batch_id):
-    """Standalone reconcile helper. Currently unused by callers — the
-    835 ingest site calls reconcile.run inline during add()."""
-    from cyclone import reconcile as _reconcile
-    with db.SessionLocal()() as s:
-        _reconcile.run(s, batch_id)
-        s.commit()